After starting an advertiser boycott of Fox News Channel host Laura Ingraham, gun-control activist David Hogg has set his sights on two new targets — iconic gun manufacturer Smith & Wesson and its capital backers.

In a series of tweets Tuesday afternoon, Mr. Hogg sicced his 764,000 Twitter followers on five investment companies, singling out two most of all — Blackrock and Vanguard Group.

“.@blackrock and @Vanguard_Group are two of the biggest investors in gun manufacturers; if you use them, feel free to let them know,” he tweeted with a winking emoji.

In one follow-up tweet he used the hashtags #BoycottBlackrock and #BoycottVanguard.

Following David’s attacks on the National Rifle Association, Google noted a 4900 per cent increase in “NRA membership” searches. More recently, David’s campaign to drive away Laura Ingraham’s advertisers resulted in a 20 per cent increase in the viewership of her show. My advice: invest in Blackrock and Vanguard now.

As someone who is not a fan of boycotts for being blunt instruments to punish and shut down speech you disagree with, it is encouraging to see that in many instances they fail to achieve their objective and often actually backfire.